How to make three dots imitating Mini Program animation?

as shown in the figure below, I wrote it using css, but it doesn"t look very smooth. It looks a little different. Do I need to use js? If there is a small example, I hope you can refer to it, that is, I think some Mini Program will appear when you enter the page. Is it handwritten by yourself?


there are three origins in the drop-down refresh of Mini Program, onPullDownRefresh ()


you can realize

through CSS animation.
  

you add backgroundColor to your transition

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